setup --host claude leaves untracked files

[kaiqiangh]

After running ./setup --host claude on a fresh clone, git status shows untracked files:

.agents/skills/gstack/bin
.agents/skills/gstack/browse
.agents/skills/gstack/review
.agents/skills/gstack/qa
.agents/skills/gstack/ETHOS.md

These are symlinks created by create_agents_sidecar() inside the repo. setup --host codex doesn't have this issue because it places symlinks in ~/.codex/skills/gstack/ (outside the repo).

Repro:

git clone --depth 1 https://github.com/garrytan/gstack.git ~/.claude/skills/gstack

cd ~/.claude/skills/gstack

./setup --host claude

git status